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The Ninjaflex substrate was 3-D printed by Hyrel 3-D printer and then the copper tape of the optimized loop antenna size was glued on the top of the 3-D hemispherical support. The connection between the 50 Ω-coaxial SMA connector and the loop antenna terminals was realized utilizing a silver epoxy.

Even though it is a desirable material for 3D printed wearable electrical, bio-medical and flexible devices, there are, to the author's knowledge, no devices taking advantage of NinjaFlex's electrical properties, mostly due to the lack of electrical characterization of this material.

V. CONCLUSION
This paper presents for the first time the electrical properties of NinjaFlex, a commonly used flexible material for 3D printing processes...

The presented accurate electrical characteristics of various NinjaFlex filaments with different densities could enable for the first time the applications of 3D printing processes to a multitude of RF applications ranging from sensing to wireless communication and localization systems.